J/ApJ/898/150ivo://CDS.VizieR/J/ApJ/898/150doi:10.26093/cds/vizier.18980150CDSEzzeddine R.Rasmussen K.Frebel A.Chiti A.Hinojisa K.Placco V.M.,Ji A.P.Beers T.C.Hansen T.T.Roederer I.U.Sakari C.M.Melendez J.2022-03-21T08:50:22Z2021-12-15T13:44:55ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frchemically-peculiar-starspopulation-ii-starsinfrared-sourcesline-intensitiesradial-velocityeffective-temperaturechemical-abundancesvisible-astronomyspectroscopyExtensive progress has recently been made in our understanding of heavy-element production via the r-process in the universe, specifically with the first observed neutron star binary merger (NSBM) event associated with the gravitational-wave signal detected by LIGO, GW170817. The chemical abundance patterns of metal-poor r-process-enhanced stars provide key evidence for the dominant site(s) of the r-process and whether NSBMs are sufficiently frequent or prolific r-process sources to be responsible for the majority of r-process material in the universe. We present atmospheric stellar parameters (using a nonlocal thermodynamic equilibrium analysis) and abundances from a detailed analysis of 141 metal-poor stars carried out as part of the R-Process Alliance (RPA) effort. We obtained high-resolution "snapshot" spectroscopy of the stars using the MIKE spectrograph on the 6.5m Magellan Clay telescope at Las Campanas Observatory in Chile. We find 10 new highly enhanced r-II (with [Eu/Fe]>+1.0), 62 new moderately enhanced r-I (+0.3<[Eu/Fe]<~+1.0), and 17 new limited-r ([Eu/Fe]<+0.3) stars. Among those, we find 17 new carbon-enhanced metal-poor (CEMP) stars, of which five are CEMP-no. We also identify one new s-process-enhanced ([Ba/Eu]>+0.5) and five new r/s (0.0<[Ba/Eu]<+0.5) stars. In the process, we discover a new ultra-metal-poor (UMP) star at [Fe/H]=-4.02. One of the r-II stars shows a deficit in {alpha} and Fe-peak elements, typical of dwarf galaxy stars. Our search for r-process-enhanced stars by RPA efforts has already roughly doubled the known r-process sample.2020ApJ...898..150Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/898/150CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)III/279 : RAVE 5th data release (Kunder+, 2017)I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)I/345 : Gaia DR2 (Gaia Collaboration, 2018)II/358 : SkyMapper Southern Sky Survey. DR1.1 (Wolf+, 2018)J/ApJ/530/783 : The r-process enriched giant HD 115444 (Westin+, 2000)J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)J/ApJ/645/613 : Abundances of HD 221170 (Ivans+, 2006)J/A+A/484/721 : HES survey. IV. Candidate metal-poor stars (Christlieb+, 2008)J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010)J/A+A/516/A46 : HE 2327-5642 abundance analysis (Mashonkina+, 2010)J/AJ/141/175 : Abundances in M15 RGB/RHB stars (Sobeck+, 2011)J/ApJ/778/56 : Hamburg/ESO Survey extremely metal-poor stars (Cohen+, 2013)J/ApJ/769/57 : Equivalent widths of metal-poor stars (Frebel+, 2013)J/MNRAS/444/392 : Synthetic Stellar Photometry. I. (Casagrande+, 2014)J/A+A/571/A47 : Extensive linelist of CH in star atmospheres (Masseron+, 2014)J/ApJ/797/21 : Carbon-enhanced metal-poor stars (Placco+, 2014)J/AJ/147/136 : Stars of very low metal abundance. VI. (Roederer+, 2014)J/ApJ/797/13 : Abundances of bright metal-poor stars (Schlaufman+, 2014)J/ApJ/830/93 : Abundances of Ret II brightest red giant members (Ji+, 2016)J/AJ/151/82 : Brightest red giants in the UFD galaxy Ret 2 (Roederer+, 2016)J/ApJ/847/142 : Ultra-metal-poor stars LTE & NLTE abundances (Ezzeddine+, 2017)J/ApJ/844/18 : RAVE J203843.2-002333 high-res. spectroscopy (Placco+, 2017)J/A+A/612/A90 : Inelastic Fe+H collision data (Barklem, 2018)J/ApJ/864/43 : Abund. of 3 bright extremely metal-poor giants (Cain+, 2018)J/ApJ/862/174 : Spectroscopy obs. of RAVE J094921.8-161722 (Gull+, 2018)J/ApJ/858/92 : RPA Southern Pilot Search of 107 Stars (Hansen+, 2018)J/AJ/155/256 : Spectroscopy of RAVE metal-poor stars (Placco+, 2018)J/AJ/156/179 : r-process-enhanced field stars kinematics (Roederer+, 2018)J/ApJ/865/129 : Abundance analysis of HD 222925 (Roederer+, 2018)J/ApJ/868/110 : R-Process Alliance: 1st release in Gal. halo (Sakari+, 2018)J/A+A/631/A80 : Mn lines in late-type stars (Bergemann+, 2019)J/ApJ/870/122 : Spectroscopy of low-metallicity star candidates (Placco+, 2019)J/ApJ/874/148 : Metal-poor star RAVE J093730.5-062655 abund. (Sakari+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/898/150https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/898/150http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/898/150https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/898/150https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/898/150http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/898/150GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/898/150/table1 (Observational details of the target stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/898/150/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/898/150/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/898/150/table1?GETtext/xml+votable180.050000true0.33.3510.0055555555555555566/4124 4184 8340 16700 16785 16815 17364 17483 17570 17579 18060 18249 18543 18604 18625 19469 22087 22814 23220 24875 25287 25573 25609 25737 25749 25842 25865 25943 26300 26382 26492 27002 27009 27263 27383 27662 27668 27682 27734 27951 28314 31203 31361 32826 32837 32964 33005 33034 33216 33391 33461 33841 34029 34053 34058 35105 35117 35234 35508 35532 36338 36825 37091 37126 37144 37188 37252 37390 37428 38218 39022 39141 39171 39307 41035 41049 41136 41148 41150 41246-41247 41312 41335 41461 41522 41547 42079 42244 43374 43447 43674 43761 44068 44250 44276 44467 44520 44744 44793 44811 44829 44846 44936 44985 44992 45096 45131 45149 45418 45508 45587 45604 45694 45747 45802 45894 45918 45976 46083 46880 46886 47103 47181 47206 47239 47299 47372 47406 47515 47551 47634 47636 47641 47707 47840 47885 47939-47940 48101 48162 48468 48645 48647 48898 49008 49010 49070 491213.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/898/150?format=asciiOpticalInfrareddefaultJ/ApJ/898/150/table1Observational details of the target stars2MASS2MASS name (JHHMMSSss+DDMMSSs)meta.id;meta.maincharprimaryf_2MASSFlag on 2MASS (1)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainVmag[10.08/14.17] RAVE DR5 V band magnitude from RAVE DR5, Kunder+ (2017, III/279)magphot.mag;em.opt.VfloatExp[240/9265] Exposure timestime.duration;obs.exposureintSlit[0.7/1] Slit widtharcsecinstr.setupfloatMJD[56763.5/58386.5] Modified Julian Date of observation (JD-2400000.5)dtime.epochfloatSN[15/200] Signal-to-noisestat.snrintHRVl[-317/473] Literature heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatHRVg[-322/472]? Gaia DR2 heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatnullabler_HRVlSource for HRVl (2)meta.ref;pos.framecharNatmNumber of atmospheric parameter measurements (link to Table 2)meta.numberintnullableAbDisplay the abundance measurements for this starmeta.ref.urlcharRAVEDisplay data from RAVE -DR5 (III/279) and -DR6 (III/283) within 3"meta.ref.urlcharGaiaDisplay data from Gaia DR2 (I/345) within 3"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/898/150/table2Atomic line properties, equivalent widths and abundances of the target starsIonSpeciesphys.atmol.ionStagecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS name (JHHMMSSss+DDMMSSs)meta.id;meta.maincharlambda[3321.69/8824.3] Wavelength, Angstroms0.1nmem.wldoubleExPot[0/5.06] Excitation potential in eVeVphys.atmol.excitationfloatlog(gf)[-5.69/0.65] Log oscillator strengthphys.atmol.oscStrengthfloatEW[0.9/1171] Equivalent width, in m{AA} units1e-13mspect.line.eqWidthfloatlogeps(x)[-1/9.3] Log number abundance of Ionlog(Sun)meta.idfloatJ/ApJ/898/150/abundStellar atmospheric parameters of the target stars (Table3), Stellar sub-classifications and associated abundances (Table4), light-element and {alpha}-element abundances (Table5) and Fe-peak element abundances (Table6)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS name (JHHMMSSss+DDMMSSs)meta.id;meta.maincharTeffLTE[4120/6470] Surface Effective Temperature, LTEKphys.temperature.effectiveintloggLTE[0/4.25] Surface gravity, LTElog(cm.s**-2)phys.gravityfloatvtLTE[1.1/5.5] Microturbulent velocity, LTEkm/sphys.velocfloat[Fe/H]LTE[-4.5/-0.5] Metallicity, LTEphys.abund.FefloatTeffLTEc[4369/6493] Surface Effective Temperature, LTE_corr_Kphys.temperature.effectiveintloggLTEc[0.3/4.4] Surface gravity, LTE_corr_log(cm.s**-2)phys.gravityfloatvtLTEc[1.2/3.9] Microturbulent velocity, LTE_corr_km/sphys.velocfloat[Fe/H]LTEc[-4.2/-0.3] Metallicity, LTE_corr_phys.abund.Fefloate_[Fe/H]LTEc[0.04/0.3] Uncertainty in [Fe/H], LTE_corr_stat.error;phys.abund.FefloatTeffNLTE[4280/6400] Surface Effective Temperature, NLTEKphys.temperature.effectiveintloggNLTE[1/4.5] Surface gravity, NLTElog(cm.s**-2)phys.gravityfloatvtNLTE[1.3/3.4] Microturbulent velocity, NLTEkm/sphys.velocfloat[Fe/H]NLTE[-4.02/-0.1] Metallicity, NLTEphys.abund.Fefloate_[Fe/H]NLTE[0.04/0.3] Uncertainty in [Fe/H], NLTEstat.error;phys.abund.FefloatNFeI[37/268] Number, FeI linesmeta.numberintNFeII[5/63] Number, FeII linesmeta.numberintloggg[0.6/4.2] Gaia surface gravitylog(cm.s**-2)phys.gravityfloatf_logggFlag on loggg (1)meta.codecharf_2MASSSource notes (2)meta.codecharl_[C/Fe]Limit flag for [C/Fe]meta.code.error;phys.abundchar[C/Fe][-3.31/1.7] Carbon to Iron abundance (G1)phys.abundfloatl_[C/Fe]cLimit flag for [C/Fe]cmeta.code.error;phys.abundchar[C/Fe]c[-2.72/1.8]? Carbon to Iron abundance, corrected (G1)(3)phys.abundfloatnullablel_[Sr/Fe]Limit flag for [Sr/Fe]meta.code.error;phys.abundchar[Sr/Fe][-2.94/1.25] Strontium to Iron abundance (G1)phys.abundfloatl_[Ba/Fe]Limit flag for [Ba/Fe]meta.code.error;phys.abundchar[Ba/Fe][-2.1/2.5] Barium to Iron abundance (G1)phys.abundfloatl_[Eu/Fe]Limit flag for [Eu/Fe]meta.code.error;phys.abundchar[Eu/Fe][-0.8/2.2]? Europium to Iron abundance (G1)phys.abundfloatnullablel_[Ba/Eu]Limit flag for [Ba/Eu]meta.code.errorchar[Ba/Eu][-1.85/0.6]? Barium to Europium abundance (G1)phys.abundfloatnullable[Sr/Ba][-3.4/2.1] Strontium to Barium abundance (G1)phys.abundfloatSub-classDominant neutron capture process (4)src.classchar[O/H][-2.2/0.71]? Oxygen to Hydrogen abundance (G1)phys.abund.Xfloatnullablee_[O/H][0.02/0.2]? Uncertainty in [O/H]stat.error;phys.abundfloatnullable[Na/H][-4.1/-0.08] Sodium to Hydrogen abundance (G1)phys.abund.Xfloate_[Na/H][0/0.23] Uncertainty in [Na/H]stat.error;phys.abundfloat[Mg/H][-3.6/-0.2] Magnesium to Hydrogen abundance (G1)phys.abundfloate_[Mg/H][0.04/0.25] Uncertainty in [Mg/H]stat.error;phys.abundfloat[Al/H][/-1.87]? Aluminum to Hydrogen abundance (G1)phys.abund.Xfloatnullablee_[Al/H][0.15]? Uncertainty in [Al/H]stat.error;phys.abundfloatnullable[Si/H][-3.6/-0.09]? Silicon to Hydrogen abundance (G1)phys.abund.Xfloatnullablee_[Si/H][0/0.27]? Uncertainty in [Si/H]stat.error;phys.abundfloatnullable[K/H][-3/-0.02]? Potassium to Hydrogen abundance (G1)phys.abund.Xfloatnullablee_[K/H][0/0.16]? Uncertainty in [K/H]stat.error;phys.abundfloatnullable[Ca/H][-3.7/-0.13] Calcium to Hydrogen abundance (G1)phys.abund.Xfloate_[Ca/H][0.04/0.32] Uncertainty in [Ca/H]stat.error;phys.abundfloat[TiI/H][-3.6/-0.4] Titanium I to Hydrogen abundance (G1)phys.abundfloate_[TiI/H][0/0.28] Uncertainty in [TiI/H]stat.error;phys.abundfloat[TiII/H][-3.8/0] Titanium II to Hydrogen abundance (G1)phys.abund.Xfloate_[TiII/H][0/0.32] Uncertainty in [TiII/H]stat.error;phys.abundfloat[Sc/H][-3.92/-0.01] Scandium to Hydrogen abundance (G1)phys.abund.Xfloate_[Sc/H][0/0.3] Uncertainty in [Sc/H]stat.error;phys.abundfloat[V/H][-3.34/0]? Vanadium to Hydrogen abundance (G1)phys.abund.Xfloatnullablee_[V/H][0/0.3]? Uncertainty in [V/H]stat.error;phys.abundfloatnullable[Cr/H][-3.8/-0.19]? Chromium to Hydrogen abundance (G1)phys.abund.Xfloatnullablee_[Cr/H][0/0.28]? Uncertainty in [Cr/H]stat.error;phys.abundfloatnullable[Mn/H][-5.03/-0.12]? Manganese to Hydrogen abundance (G1)phys.abund.Xfloatnullablee_[Mn/H][0/0.3]? Uncertainty in [Mn/H]stat.error;phys.abundfloatnullable[Co/H][-3.7/-0.03]? Cobalt to Hydrogen abundance (G1)phys.abund.Xfloatnullablee_[Co/H][0/0.3]? Uncertainty in [Co/H]stat.error;phys.abundfloatnullable[Ni/H][-4.04/-0.25] Nickel to Hydrogen abundance (G1)phys.abund.Xfloate_[Ni/H][0/0.31] Uncertainty in [Ni/H]stat.error;phys.abundfloat[Zn/H][-3.38/-0.28]? Zinc to Hydrogen abundance (G1)phys.abund.Xfloatnullablee_[Zn/H][0/0.18]? Uncertainty in [Zn/H]stat.error;phys.abundfloatnullable